FR2738766A1 - Mould useful esp. for injection moulding thermoplastic materials - Google Patents
Mould useful esp. for injection moulding thermoplastic materials Download PDFInfo
- Publication number
- FR2738766A1 FR2738766A1 FR9510770A FR9510770A FR2738766A1 FR 2738766 A1 FR2738766 A1 FR 2738766A1 FR 9510770 A FR9510770 A FR 9510770A FR 9510770 A FR9510770 A FR 9510770A FR 2738766 A1 FR2738766 A1 FR 2738766A1
- Authority
- FR
- France
- Prior art keywords
- weight
- resin
- injection moulding
- silica
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3807—Resin-bonded materials, e.g. inorganic particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2863/00—Use of EP, i.e. epoxy resins or derivatives thereof as mould material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2903/00—Use of resin-bonded materials as mould material
- B29K2903/04—Inorganic materials
- B29K2903/08—Mineral aggregates, e.g. sand, clay or the like
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
La présente invention concerne la fabrication de moules prototypes destinés au moulage par injection de matières plastiques et plus particulièrement de matières thermo-plastiques. The present invention relates to the manufacture of prototype molds intended for injection molding of plastics and more particularly of thermoplastic materials.
On sait que dans les procédés de moulage par injection de matières thermoplastiques, on utilise un moule hermétiquement fermé dans lequel la matière plastique est injectée à l'aide d'une buse d'injection qui débite la matière plastique fluidifiée. Jusqu'à présent, les moules utilisés dans cette technique ont été réalisés en métal et plus particulièrement en acier. Les tentatives effectuées en vue de remplacer le métal par d'autres matériaux plus faciles à mettre en oeuvre et notamment des matières plastiques n'ont pas été couronnées de succès comptetenu des caractéristiques mécaniques, notamment de rigidité et d'indéformabilité, que doivent présenter de tels moules pour effectuer le moulage par injection. It is known that in the injection molding processes of thermoplastics, a hermetically closed mold is used in which the plastic is injected using an injection nozzle which delivers the fluidized plastic. Until now, the molds used in this technique have been made of metal and more particularly of steel. Attempts to replace metal with other materials which are easier to use and in particular plastics have not been successful, given the mechanical characteristics, in particular of rigidity and non-deformability, which must be present. such molds for performing injection molding.
La présente invention s'est donc fixé pour objectif de réaliser des moules pour le moulage par injection de matières plastiques en un matériau autre que l'acier tout en présentant les mêmes caractéristiques mécaniques que les moules en acier, et ceci dans des conditions économiques particulièrement intéressantes. The present invention has therefore set itself the objective of producing molds for the injection molding of plastics in a material other than steel while having the same mechanical characteristics as steel molds, and this under particularly economical conditions. interesting.
Selon la présente invention, le moule est réalisé par mélange à froid de la composition suivante:
- résine époxy: 0,5 à 1,5 parties en poids
- durcisseur pour la résine époxy: 5 à 10% en poids de la quantité de résine
- silice : 2 à 4 parties en poids.According to the present invention, the mold is produced by cold mixing the following composition:
- epoxy resin: 0.5 to 1.5 parts by weight
- hardener for epoxy resin: 5 to 10% by weight of the amount of resin
- silica: 2 to 4 parts by weight.
De préférence, on utilise la composition suivante:
- résine époxy: 1 partie en poids avec en outre la quantité de durcisseur
appropriée à la résine choisie: de 5 à 10% en poids de ladite résine;
- silice: 3 parties en poids.Preferably, the following composition is used:
- epoxy resin: 1 part by weight with in addition the quantity of hardener
suitable for the resin chosen: from 5 to 10% by weight of said resin;
- silica: 3 parts by weight.
La silice utilisée dans les compositions mentionnées ci-dessus est de préférence du sable fin. The silica used in the compositions mentioned above is preferably fine sand.
A titre d'exemple non limitatif, on indique que l'on peut utiliser comme résine époxy, une résine polyépoxyde commercialisée sous la dénomination Araldite . By way of nonlimiting example, it is indicated that a polyepoxide resin sold under the name Araldite can be used as epoxy resin.
Plus particulièrement, on peut utiliser I' Ladite SW 5155 commercialisée par la
Firme CIBA, conjointement avec un durcisseur HY 5159 commercialisé par la même firme, en utilisant 100 parties en poids d' Araldite > pour 10 parties en poids de durcisseur. Bien entendu, le mélange doit respecter les proportions respectives de résine et de silice mentionnées cidessus. More particularly, the said SW 5155 marketed by the
CIBA firm, together with a HY 5159 hardener marketed by the same firm, using 100 parts by weight of Araldite> per 10 parts by weight of hardener. Of course, the mixture must respect the respective proportions of resin and silica mentioned above.
On peut également, et dans les mêmes conditions utiliser I' Araldite SW 5156 commercialisée par la Firme CIBA conjointement avec un durcisseur HY 5158 commercialisé par la même firme, en mettant en oeuvre 100 parties en poids d' Araldite pour 8 parties en poids de durcisseur, le mélange respectant par ailleurs les proportions respectives de résine et de silice mentionnées ci-dessus. It is also possible, and under the same conditions, to use the Araldite SW 5156 marketed by the firm CIBA jointly with a hardener HY 5158 marketed by the same firm, using 100 parts by weight of Araldite for 8 parts by weight of hardener. , the mixture also respecting the respective proportions of resin and silica mentioned above.
Ainsi qu'on l'a précisé ci-dessus, les constituants sont mélangés à froid jusqu'à l'obtention d'un mélange homogène, ce dernier étant ensuite mis en oeuvre de façon classique pour réaliser le moule, par coffrage autour d'un modèle de la pièce devant être réalisée. As specified above, the constituents are mixed cold until a homogeneous mixture is obtained, the latter then being used in a conventional manner to produce the mold, by formwork around a model of the part to be produced.
Comme dans les moules pour moulage par injection classique en acier actuellement réalisés, on utilise des tuyaux de refroidissement (voies calorifères) qui sont noyés dans le mélange lors de la réalisation du moule et également des éjecteurs tubulaires, également noyés dans le mélange. As in the molds for conventional injection molding in steel currently produced, cooling pipes are used (heat pipes) which are embedded in the mixture during the production of the mold and also tubular ejectors, also embedded in the mixture.
L'invention permet de réaliser des moules présentant des propriétés mécaniques similaires à celles de l'acier avec des prix de revient très inférieurs ainsi un moule en acier destiné à mouler par injection un bouclier de véhicules automobiles coûte environ FF. 4 500 000 alors qu'un moule réalisé dans les mêmes conditions et pour les mêmes applications avec la composition objet de la présente invention revient à environ FF. 450 000. The invention makes it possible to produce molds having mechanical properties similar to those of steel with very lower cost prices, thus a steel mold intended for injection molding a shield of motor vehicles costs approximately FF. 4,500,000 while a mold produced under the same conditions and for the same applications with the composition which is the subject of the present invention amounts to approximately FF. 450,000.
Le moule selon la présente invention peut être utilisé sur des presses d'injection de grandes séries, dans les mêmes conditions que les moules en acier équivalents, notamment pour le moulage de pare-chocs, de calandres, d'habillages intérieurs de véhicules automobiles, etc... The mold according to the present invention can be used on injection molding machines of large series, under the same conditions as the equivalent steel molds, in particular for the molding of bumpers, calenders, interior trim of motor vehicles, etc ...
II demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation et d'applications décrits etlou mentionnés ici mais qu'elle en englobe toutes les variantes. It remains to be understood that the present invention is not limited to the exemplary embodiments and applications described and / or mentioned here, but that it encompasses all variants thereof.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9510770A FR2738766A1 (en) | 1995-09-14 | 1995-09-14 | Mould useful esp. for injection moulding thermoplastic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9510770A FR2738766A1 (en) | 1995-09-14 | 1995-09-14 | Mould useful esp. for injection moulding thermoplastic materials |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2738766A1 true FR2738766A1 (en) | 1997-03-21 |
Family
ID=9482532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9510770A Pending FR2738766A1 (en) | 1995-09-14 | 1995-09-14 | Mould useful esp. for injection moulding thermoplastic materials |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2738766A1 (en) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2185486A1 (en) * | 1972-05-23 | 1974-01-04 | Kuraray Co | |
FR2322898A1 (en) * | 1975-09-05 | 1977-04-01 | Bayer Ag | Gas-permeable smooth or relief surfaces - for vacuum forming moulds, produced from epoxide-glass ball compsns. contg. hardeners |
FR2345276A1 (en) * | 1976-03-24 | 1977-10-21 | Dynamit Nobel Ag | PROCESS FOR MANUFACTURING A MOLD FROM RESINS REACTIVE WITH LOADS AND MOLD THUS OBTAINED |
US4546674A (en) * | 1980-10-21 | 1985-10-15 | Clark Lonel L | Method for providing a tool for forming an article |
JPS63278808A (en) * | 1987-05-11 | 1988-11-16 | Tokai Carbon Co Ltd | Resin mold |
JPS6444710A (en) * | 1987-08-12 | 1989-02-17 | Tokai Carbon Kk | Resin mold and its manufacture |
US4952355A (en) * | 1988-09-12 | 1990-08-28 | Seward Thomas J | Method for making a plastic tool |
JPH05200756A (en) * | 1992-01-28 | 1993-08-10 | Toto Ltd | Production of temperature controlled mold |
JPH05295083A (en) * | 1992-04-24 | 1993-11-09 | Nippon Kayaku Co Ltd | Epoxy resin composition for mold and resin mold made thereof |
-
1995
- 1995-09-14 FR FR9510770A patent/FR2738766A1/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2185486A1 (en) * | 1972-05-23 | 1974-01-04 | Kuraray Co | |
FR2322898A1 (en) * | 1975-09-05 | 1977-04-01 | Bayer Ag | Gas-permeable smooth or relief surfaces - for vacuum forming moulds, produced from epoxide-glass ball compsns. contg. hardeners |
FR2345276A1 (en) * | 1976-03-24 | 1977-10-21 | Dynamit Nobel Ag | PROCESS FOR MANUFACTURING A MOLD FROM RESINS REACTIVE WITH LOADS AND MOLD THUS OBTAINED |
US4546674A (en) * | 1980-10-21 | 1985-10-15 | Clark Lonel L | Method for providing a tool for forming an article |
JPS63278808A (en) * | 1987-05-11 | 1988-11-16 | Tokai Carbon Co Ltd | Resin mold |
JPS6444710A (en) * | 1987-08-12 | 1989-02-17 | Tokai Carbon Kk | Resin mold and its manufacture |
US4952355A (en) * | 1988-09-12 | 1990-08-28 | Seward Thomas J | Method for making a plastic tool |
JPH05200756A (en) * | 1992-01-28 | 1993-08-10 | Toto Ltd | Production of temperature controlled mold |
JPH05295083A (en) * | 1992-04-24 | 1993-11-09 | Nippon Kayaku Co Ltd | Epoxy resin composition for mold and resin mold made thereof |
Non-Patent Citations (4)
Title |
---|
DATABASE WPI Section Ch Week 9349, December 1993 Derwent World Patents Index; Class A21, AN 93-392736 [49], XP002004813 * |
PATENT ABSTRACTS OF JAPAN vol. 13, no. 229 (M - 831) 26 May 1989 (1989-05-26) * |
PATENT ABSTRACTS OF JAPAN vol. 13, no. 77 (M - 801) 22 February 1989 (1989-02-22) * |
PATENT ABSTRACTS OF JAPAN vol. 17, no. 635 (M - 1514) 25 November 1993 (1993-11-25) * |
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